1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _ASM_X86_BOOTPARAM_H
3#define _ASM_X86_BOOTPARAM_H
4
5#include <asm/setup_data.h>
6
7/* ram_size flags */
8#define RAMDISK_IMAGE_START_MASK 0x07FF
9#define RAMDISK_PROMPT_FLAG 0x8000
10#define RAMDISK_LOAD_FLAG 0x4000
11
12/* loadflags */
13#define LOADED_HIGH (1<<0)
14#define KASLR_FLAG (1<<1)
15#define QUIET_FLAG (1<<5)
16#define KEEP_SEGMENTS (1<<6)
17#define CAN_USE_HEAP (1<<7)
18
19/* xloadflags */
20#define XLF_KERNEL_64 (1<<0)
21#define XLF_CAN_BE_LOADED_ABOVE_4G (1<<1)
22#define XLF_EFI_HANDOVER_32 (1<<2)
23#define XLF_EFI_HANDOVER_64 (1<<3)
24#define XLF_EFI_KEXEC (1<<4)
25#define XLF_5LEVEL (1<<5)
26#define XLF_5LEVEL_ENABLED (1<<6)
27#define XLF_MEM_ENCRYPTION (1<<7)
28
29#ifndef __ASSEMBLER__
30
31#include <linux/types.h>
32#include <linux/screen_info.h>
33#include <linux/apm_bios.h>
34#include <linux/edd.h>
35#include <asm/ist.h>
36#include <video/edid.h>
37
38struct setup_header {
39 __u8 setup_sects;
40 __u16 root_flags;
41 __u32 syssize;
42 __u16 ram_size;
43 __u16 vid_mode;
44 __u16 root_dev;
45 __u16 boot_flag;
46 __u16 jump;
47 __u32 header;
48 __u16 version;
49 __u32 realmode_swtch;
50 __u16 start_sys_seg;
51 __u16 kernel_version;
52 __u8 type_of_loader;
53 __u8 loadflags;
54 __u16 setup_move_size;
55 __u32 code32_start;
56 __u32 ramdisk_image;
57 __u32 ramdisk_size;
58 __u32 bootsect_kludge;
59 __u16 heap_end_ptr;
60 __u8 ext_loader_ver;
61 __u8 ext_loader_type;
62 __u32 cmd_line_ptr;
63 __u32 initrd_addr_max;
64 __u32 kernel_alignment;
65 __u8 relocatable_kernel;
66 __u8 min_alignment;
67 __u16 xloadflags;
68 __u32 cmdline_size;
69 __u32 hardware_subarch;
70 __u64 hardware_subarch_data;
71 __u32 payload_offset;
72 __u32 payload_length;
73 __u64 setup_data;
74 __u64 pref_address;
75 __u32 init_size;
76 __u32 handover_offset;
77 __u32 kernel_info_offset;
78} __attribute__((packed));
79
80struct sys_desc_table {
81 __u16 length;
82 __u8 table[14];
83};
84
85/* Gleaned from OFW's set-parameters in cpu/x86/pc/linux.fth */
86struct olpc_ofw_header {
87 __u32 ofw_magic; /* OFW signature */
88 __u32 ofw_version;
89 __u32 cif_handler; /* callback into OFW */
90 __u32 irq_desc_table;
91} __attribute__((packed));
92
93struct efi_info {
94 __u32 efi_loader_signature;
95 __u32 efi_systab;
96 __u32 efi_memdesc_size;
97 __u32 efi_memdesc_version;
98 __u32 efi_memmap;
99 __u32 efi_memmap_size;
100 __u32 efi_systab_hi;
101 __u32 efi_memmap_hi;
102};
103
104/*
105 * This is the maximum number of entries in struct boot_params::e820_table
106 * (the zeropage), which is part of the x86 boot protocol ABI:
107 */
108#define E820_MAX_ENTRIES_ZEROPAGE 128
109
110/*
111 * Smallest compatible version of jailhouse_setup_data required by this kernel.
112 */
113#define JAILHOUSE_SETUP_REQUIRED_VERSION 1
114
115/* The so-called "zeropage" */
116struct boot_params {
117 struct screen_info screen_info; /* 0x000 */
118 struct apm_bios_info apm_bios_info; /* 0x040 */
119 __u8 _pad2[4]; /* 0x054 */
120 __u64 tboot_addr; /* 0x058 */
121 struct ist_info ist_info; /* 0x060 */
122 __u64 acpi_rsdp_addr; /* 0x070 */
123 __u8 _pad3[8]; /* 0x078 */
124 __u8 hd0_info[16]; /* obsolete! */ /* 0x080 */
125 __u8 hd1_info[16]; /* obsolete! */ /* 0x090 */
126 struct sys_desc_table sys_desc_table; /* obsolete! */ /* 0x0a0 */
127 struct olpc_ofw_header olpc_ofw_header; /* 0x0b0 */
128 __u32 ext_ramdisk_image; /* 0x0c0 */
129 __u32 ext_ramdisk_size; /* 0x0c4 */
130 __u32 ext_cmd_line_ptr; /* 0x0c8 */
131 __u8 _pad4[112]; /* 0x0cc */
132 __u32 cc_blob_address; /* 0x13c */
133 struct edid_info edid_info; /* 0x140 */
134 struct efi_info efi_info; /* 0x1c0 */
135 __u32 alt_mem_k; /* 0x1e0 */
136 __u32 scratch; /* Scratch field! */ /* 0x1e4 */
137 __u8 e820_entries; /* 0x1e8 */
138 __u8 eddbuf_entries; /* 0x1e9 */
139 __u8 edd_mbr_sig_buf_entries; /* 0x1ea */
140 __u8 kbd_status; /* 0x1eb */
141 __u8 secure_boot; /* 0x1ec */
142 __u8 _pad5[2]; /* 0x1ed */
143 /*
144 * The sentinel is set to a nonzero value (0xff) in header.S.
145 *
146 * A bootloader is supposed to only take setup_header and put
147 * it into a clean boot_params buffer. If it turns out that
148 * it is clumsy or too generous with the buffer, it most
149 * probably will pick up the sentinel variable too. The fact
150 * that this variable then is still 0xff will let kernel
151 * know that some variables in boot_params are invalid and
152 * kernel should zero out certain portions of boot_params.
153 */
154 __u8 sentinel; /* 0x1ef */
155 __u8 _pad6[1]; /* 0x1f0 */
156 struct setup_header hdr; /* setup header */ /* 0x1f1 */
157 __u8 _pad7[0x290-0x1f1-sizeof(struct setup_header)];
158 __u32 edd_mbr_sig_buffer[EDD_MBR_SIG_MAX]; /* 0x290 */
159 struct boot_e820_entry e820_table[E820_MAX_ENTRIES_ZEROPAGE]; /* 0x2d0 */
160 __u8 _pad8[48]; /* 0xcd0 */
161 struct edd_info eddbuf[EDDMAXNR]; /* 0xd00 */
162 __u8 _pad9[276]; /* 0xeec */
163} __attribute__((packed));
164
165/**
166 * enum x86_hardware_subarch - x86 hardware subarchitecture
167 *
168 * The x86 hardware_subarch and hardware_subarch_data were added as of the x86
169 * boot protocol 2.07 to help distinguish and support custom x86 boot
170 * sequences. This enum represents accepted values for the x86
171 * hardware_subarch. Custom x86 boot sequences (not X86_SUBARCH_PC) do not
172 * have or simply *cannot* make use of natural stubs like BIOS or EFI, the
173 * hardware_subarch can be used on the Linux entry path to revector to a
174 * subarchitecture stub when needed. This subarchitecture stub can be used to
175 * set up Linux boot parameters or for special care to account for nonstandard
176 * handling of page tables.
177 *
178 * These enums should only ever be used by x86 code, and the code that uses
179 * it should be well contained and compartmentalized.
180 *
181 * KVM and Xen HVM do not have a subarch as these are expected to follow
182 * standard x86 boot entries. If there is a genuine need for "hypervisor" type
183 * that should be considered separately in the future. Future guest types
184 * should seriously consider working with standard x86 boot stubs such as
185 * the BIOS or EFI boot stubs.
186 *
187 * WARNING: this enum is only used for legacy hacks, for platform features that
188 * are not easily enumerated or discoverable. You should not ever use
189 * this for new features.
190 *
191 * @X86_SUBARCH_PC: Should be used if the hardware is enumerable using standard
192 * PC mechanisms (PCI, ACPI) and doesn't need a special boot flow.
193 * @X86_SUBARCH_LGUEST: Used for x86 hypervisor demo, lguest, deprecated
194 * @X86_SUBARCH_XEN: Used for Xen guest types which follow the PV boot path,
195 * which start at asm startup_xen() entry point and later jump to the C
196 * xen_start_kernel() entry point. Both domU and dom0 type of guests are
197 * currently supported through this PV boot path.
198 * @X86_SUBARCH_INTEL_MID: Used for Intel MID (Mobile Internet Device) platform
199 * systems which do not have the PCI legacy interfaces.
200 * @X86_SUBARCH_CE4100: Used for Intel CE media processor (CE4100) SoC
201 * for settop boxes and media devices, the use of a subarch for CE4100
202 * is more of a hack...
203 */
204enum x86_hardware_subarch {
205 X86_SUBARCH_PC = 0,
206 X86_SUBARCH_LGUEST,
207 X86_SUBARCH_XEN,
208 X86_SUBARCH_INTEL_MID,
209 X86_SUBARCH_CE4100,
210 X86_NR_SUBARCHS,
211};
212
213#endif /* __ASSEMBLER__ */
214
215#endif /* _ASM_X86_BOOTPARAM_H */
216

source code of linux/arch/x86/include/uapi/asm/bootparam.h